.middle > div {
    width: 900px;
    margin: 50px 0;
    border: 1px solid gray;
}

.middle > div > div:nth-child(2) > div:nth-child(1) {
    margin: 50px 0 40px 0;
}

.temp-one {
    color: rgb(230, 145, 55);
    font-size: 30px;
}

.temp-two {
    color: gray;
    font-size: 15px;

}

.temp-three {
    text-align: center;
}

/*------------------表单---------------*/
/*元素选择器*/
form {
    width: 600px;
}

form > div:nth-child(1) input {
    width: 600px;
    border: 1px dashed gray;
    background-color: rgb(238, 238, 238);
    line-height: 30px;
    padding: 0 10px;
}

form textarea {
    width: 600px;
    height: 100px;
    border: 1px dashed gray;
    background-color: rgb(238, 238, 238);
    padding: 10px;
    min-height: 100px;
    resize: vertical;
}

form .title {
    line-height: 30px;
}

form > div:nth-child(1) > div > div:nth-child(1) {
    line-height: 30px;
}

form input[type=submit] {
    margin: 30px;
    background-color: rgb(230, 145, 55);
    color: white;
    padding: 10px 50px;
    border: none;
    border-radius: 0 50px 50px 0;
    box-shadow: 1px 2px 2px 1px red;
}